Window stop sash balance



ug. 23, 1955 M. E. PRossr-:R ErAL 2,7l5f747 WINDOW STOP sAsH BALANCEFiled July 2l, 1952 2 Sheets-Sheec l Fig. l 'Fig' g 1 if ,.M vm

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Filed July 2l, 1952 Fig-4 M. E. PROSSER ET'AL WINDOW STOP SASH BALANCE 2Sheets-Sheet 2 Dw/GHr M. PassER Mari/da E. Prosser INI/ENTORI` ana/wy15mm wiNnow sro? sAsr-r BALANCE Matilda E. Prosser and Dwight M.Prosser, Mansfield, Ohio, assignors to Peerless Baiance Co., Mansfield,hio, a corporation of Ohio Appiication .lluly 21, 1952, Serial No.299,967

4 Claims. (Cl. 16-198) This invention relates to a window stop andparticularly to a parting stop containing balance members for supportingthe sash of a double hung window in any desired position.

ln the utilization of double hung windows it is highly desirable toprovide balance means for counteracting the f weight of the sash so thatthe sash may be opened and left in any desired position. lt has longbeen customary to provide sash weights slidable in a back portion of thewindow frame and connected to the sash by means of cords passing over apulley. Not only are the sash cords highly unsightly because of theirtraversing over the face of the window frame but also in the event thecord becomes broken or otherwise damaged it is necessary to perform amajor carpentry operation on the window frame to restore the same.permanent disgurement of the window frame or window supporting structureso that it is frequently desirable to completely replace the windowframe to obviate such disgurement.

lt has also been customary to use so-called spring balancers forsupporting the sash of double hung windows. These spring supports havesubstantially all of the inconvenience of the sash cord supports in thatmajor carpentry operations must be performed to embed the springs andalso in the event they break or otherwise become disabled it isfrequently necessary to completely destroy a portion of the window inorder to remove the faulty devices. The same holds true for springbalancers making use of multiplying sheaves, as in Cross et al. Patent2,262,990.

The present invention has for its principal object to provide a sashbalance of this kind which can be readily placed in position in andremoved from a window frame without disturbing any of the windowconstruction. This is accomplished by means of a parting stop which isplaced between the upper and lower sections of the window to maintainthem in smoothly guided relation to each other and within which thenecessary balance springs and multiplying equipment are contained, withthe sash cords emerging therefrom in such manner that they are invisibleor at least inconspicuous when the sash is raised or lowered. Ifdesired, the parting stop may be provided with grooves accommodating thesash cord so that the sash cord may be attached to the sash without anycarpentry operation on the frame.

Other objects and many of the attendant advantages of the invention willlbe apparent from the following detailed description taken inconjunction with the accompanying drawings in which:

Figure l is an edge elevation with parts in section of a window frameincorporating a parting stop made according to the invention;

Figure 2 is an enlarged cross-section taken substantially on the planeindicated by the line 2 2 of Figure l;

Figure 3 is an enlarged fragmentary cross-section of the window frameand parting stop taken substantially on the plane indicated by the lines3 3 of Figure l;

Figure 4 is a section-al side elevation of the parting stop Suchoperations frequently cause 'i ice taken substantially on the planeindicated by the line 4 4 of Figure 2;

Figure 5 is a sectional front elevation of the parting stop takensubstantially on the plane indicated by the line 5 5 of Figure 4;

Figure 6 is an enlarged fragmentary section of a portion of the stopshowing the construction for bringing out the sash cords;

Figure 7 is an enlarged fragmentary section of the parting stop showingthe balance hanger and taken substantially on the plane indicated byline 7 7 of Figure 5; and

Figure 8 is a section through the sheave block taken substantially onthe plane indicated by the line 8 8 of Figure 7.

In the exemplary embodiment of the invention the lower sash 10 and anupper sash 12 are mounted in a window frame 14 having an outer guidestrip 16 and an inner separable stop strip 18. The frame member 14 isprovided with a shallow groove in which is mounted the parting stop ofthe present invention, such parting stop taking the place of the usualwood parting stop. The sashes 10 and 12 are provided with check rails 22and 24 which meet in substantially flush engagement when the sashes areclosed so that no atmospheric moisture will pass through the window.

The parting stop of the present invention comprises a more or lesstubular stop member 26 of U-shaped or channel-shaped cross-section and,if desired, a suitable closure member 28. Preferably the stop member 26is secured in groove 20 by means of suitable fasteners such as screws30. Obviously members 26 and 28 may be made of any suitable materialsuch as plastic or metal but are preferably formed of metal. Along theinner side 32 thereof stop member 26 is preferably substantially smoothso that the ends of check rails 22 and 24 can have the closest possibleclearance therewith. The front face 34 and the back face 36 are keptrigidly spaced apart by means of suitable spacer members having asubstantially cylindrical central portion and reduced rivetlike ends 42and 44 (Figure 5) attached thereto by riveting over. However, spacermembers 40 may be attached by welding, soldering or any other desiredmethod.

Apertures 46 provided in closure member 28 and registering apertures 48are similarly provided in stop member 26 so that the screws 30 may bepassed through them into the frame 14.

Operating mechanism for the device as a whole includes, along with twocoil springs 5t) and 54, a pair of fixed sheave blocks and a pair ofsliding sheave blocks which are substantially identical in constructionand which will now be described. Each of the sliding sheave blockscontains side plates 58 and 60 (Figure 7) which are spaced apart bysuitable spacer members 62 and 64, upper and lower, each of whichincludes a substantially cylindrical central portion and reduced endportions 68 and 70. The latter pass through apertures 72 and 74 inplates 58 and 6h and are preferably peened over to rigidly mount theplates 58 and 60 in spaced relation with each other. The xed sheaveblocks are similarly constructed but lack lower spacer members. In eachcase, an axle 76 that is substantially identical with spacer members 62and 64 is rigidly mounted intermediate the ends of the plates S8 and 60and preferably centrally thereof and sheaves 78 are journaled thereon.Suitable spacers 80 and 82 are preferably provided on axle 76 forlocating the sheaves 78 as desired therein.

One of the fixed sheave blocks is mounted substantially centrallybetween the upper and lower ends of the stop member 26 by means of oneof the spacer members 40. It and the parts which lie below it, includingthe lower 3 of the two sliding sheave blocks and lower spring 50,constitute a unitary assembly controlling lower sash 10. Another of thefixed sheave blocks is mounted adjacent the top of the stop member 26,preferably by engagement with yanother of the spacer members 40. Alongwith upper spring 54 and the upper of the two sliding sheave blocks, itforms a similar unitary assembly controlling upper sash 12. Each of thesprings has its ends provided as shown with loops such as 52, 84 and 56,86, each of .the lower loops being associated with a stationary elementsuch as one of the spacer members 40 and each of the upper loops beingassociated with the lower spacer member 64 of one of the sliding sheaveblocks.

The back face 56 of the parting stop is provided with an outlet eyelet90 (Figure 6) through which `a lower sash cord 92 extends outwardly tolower sash 10, to which itis connected by any suitable means such as ascrew 94. The lower sash cord 92 is entrained as shown in Figures 4 and5 over the sheaves of the lower fixed sheave block and also yover thesheaves of the lower sliding sheave bloelk, which is' attached to lowerspring 50. Cord 92 passes over the sheaves an appreciable number oftimes and the stroke of the cord is a corresponding multiple of thestroke of the upper end of spring 50. The other end of the cord 92 isattached to one of the spacer members such as 62 by any suitable meanssuch as' a loop 96.

Front face 34 of the stop member 26 is likewise provided with an eyelet98 for the upper sash cord 100, which is attached to the upper sash 12.The upper sash cord 100 extends upwardly to the upper xed sheave blockand is entrained a number of times over the sheaves of the upper fixedsheave block and the sheaves of the upper sliding sheave block, thearrangement being substantially identical lto the arrangement alreadydescribed in the case of lower sash cord 92.

In the utilization of the device a pair of stop members 26 is arrangedon opposite sides of a window frame and attached to the sashes 10 and12. In back face 36 of each a groove 104 is provided to accommodatescrew head 94 and the lower sash cord 92-see Figure 6. Such groove isalways completely covered by the lower sash 10 when the window is closedand is visible only when the sash is raised. Likewise, in front face 34a groove 106 is provided below the eyelet 98. Groove 106 extendsdownwardly therefrom to accommodate upper sash cord 100 in such mannerthat the sash cord 100 will always be concealed by the upper sash 12.

In the event the sash balances should become damaged Cil in any manner,the entire stop member may be readily removed from the window and a newstop member inserted.

For purposes of exempliiication a particular embodiment of the inventionhas been shown and described according to the best understandingthereof. It will be apparent to those skilled in the art that changesand modifications can be made therein without departing from the truespirit of the invention.

Having described the invention, Vwhat is claimed as new is:

1. In a hollow parting stop of channel-shaped crosssection the bight inwhich is intended to face a window frame, internal anchor means spanningthe channel from side to side thereof at a point near the middle of theparting stop; a first spring and sheave group sash balancing system onone side of said anchor means; a second spring and sheave group sashbalancing system on the other side of said anchor means, and meansconstituting part of the spring of the first sash balancing system andpart of the sheave group of the second sash balancing system forpositioning the proximate ends of said sash balancing systems inrelation to the internal anchor means.

2. A window frame clement as in claim 1 in which the means constitutingpart of the spring of the iirst sash balancing system is disposedimmediately above and the means constituting part of the sheave group ofthe second sash balancing system is disposed immediately below theanchor means.

3. A window frame element as in claim 2 in which the sheave group of thefirst sash balancing system is attached to the parting stop near theupper end of the stop and the spring of the second sash balancing systemis attached to the stop near the lower end of the stop.

4. A window frame element as in claim 3 in which each of the two sashbalancing systems has a sliding sheave block disposed roughly midwaybetween the internal anchor means and the end of the parting stop towhich the sash balancing system is attached.

References Cited in the tile of this patent UNITED STATES PATENTS1,911,469 Rosenwald May 30, 1933 2,262,990 Cross et al Nov. 18, 19412,279,600 Tappen Apr. 14, 1942 2,336,406 Kreuscher Dec. 7, 19432,628,390 Starck Feb. 17, 1953

